package com.boc.langxiang.ui.adapter.me;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.Log;
import android.view.View;

/**
 * *******************************************************************
 *
 * @AUTHOR：zgsHighwin
 * @DATE：一月 20, 2016/1/20
 * @DESCRIPTION： 用于recyleview的间隔设置，只适用于gridlayout，LinearLayout只要将GridLayout的改成1就行了
 * *********************************************************************
 */
public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
    //private static final int[] ATTRS = new int[] { android.R.attr.listDivider };
    // private Drawable mDivider;
    private int mWidth;

    public SpacesItemDecoration(Context context, int width) {
        //    final TypedArray a = context.obtainStyledAttributes(ATTRS);
        this.mWidth = width;
        //    mDivider = a.getDrawable(0);
        //    a.recycle();
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {

        drawHorizontal(c, parent);
        drawVertical(c, parent);

    }

    private int getSpanCount(RecyclerView parent) {
        // 列数
        int spanCount = -1;
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager) {

            spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            spanCount = ((StaggeredGridLayoutManager) layoutManager)
                    .getSpanCount();
        }
        return spanCount;
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getLeft() - params.leftMargin;
           /* final int right = child.getRight() + params.rightMargin
                    + mDivider.getIntrinsicWidth();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);*/
        }
    }

    public void drawVertical(Canvas c, RecyclerView parent) {
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);

            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getTop() - params.topMargin;
            final int bottom = child.getBottom() + params.bottomMargin;
            final int left = child.getRight() + params.rightMargin;
         /*   final int right = left + mDivider.getIntrinsicWidth();

            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);*/
        }
    }

    private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
                                int childCount) {
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager) {
            if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
            {
                return true;
            }
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            int orientation = ((StaggeredGridLayoutManager) layoutManager)
                    .getOrientation();
            if (orientation == StaggeredGridLayoutManager.VERTICAL) {
                if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
                {
                    return true;
                }
            } else {
                childCount = childCount - childCount % spanCount;
                if (pos >= childCount)// 如果是最后一列，则不需要绘制右边
                    return true;
            }
        }
        return false;
    }

    private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,
                              int childCount) {
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager) {
            if(spanCount==1){
                if(pos>=childCount-1) {
                    return true;
                }
            }else{
                childCount = childCount - childCount % spanCount;
                if (pos >= childCount)// 如果是最后一行，则不需要绘制底部
                    return true;
            }

        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            int orientation = ((StaggeredGridLayoutManager) layoutManager)
                    .getOrientation();
            // StaggeredGridLayoutManager 且纵向滚动
            if (orientation == StaggeredGridLayoutManager.VERTICAL) {
                childCount = childCount - childCount % spanCount;
                // 如果是最后一行，则不需要绘制底部
                if (pos >= childCount)
                    return true;
            } else
            // StaggeredGridLayoutManager 且横向滚动
            {
                // 如果是最后一行，则不需要绘制底部
                if ((pos + 1) % spanCount == 0) {
                    return true;
                }
            }
        }
        return false;
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition,
                               RecyclerView parent) {
        int spanCount = getSpanCount(parent);
        Log.d("SpacesItemDecoration", "spanCount:" + spanCount);
        int childCount = parent.getAdapter().getItemCount();
        Log.d("SpacesItemDecoration", "childCount:" + childCount);
        if (isLastRaw(parent, itemPosition, spanCount, childCount))// 如果是最后一行，则不需要绘制底部
        {
            // outRect.set(mWidth, mWidth, mDivider.getIntrinsicWidth(), mWidth);
            if(isLastColum(parent, itemPosition, spanCount, childCount)){
                outRect.set(mWidth, mWidth,mWidth , mWidth);
            }else{
                outRect.set(mWidth, mWidth, 0, mWidth);
            }
        } else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最后一列，则不需要绘制右边
        {
            //  outRect.set(mWidth, mWidth, mWidth, mDivider.getIntrinsicHeight());
            outRect.set(mWidth, mWidth, mWidth, 0);
        } else {
//            outRect.set(mWidth, mWidth, mDivider.getIntrinsicWidth(),
//                    mDivider.getIntrinsicHeight());
            outRect.set(mWidth, mWidth, 0, 0);
        }
    }
  /*  private int space;

    public SpacesItemDecoration(int space) {
        this.space = space;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view,
                               RecyclerView parent, RecyclerView.State state) {
        outRect.right = space;
        outRect.bottom = space;


        if(parent.getChildPosition(view) == 0){
            outRect.top = space;
            outRect.left = space;
        }

    }*/
}